package homework07;

import java.util.Random;

/**
 * 需求:生成?位验证码(大写字母、小写字母、数字)
 */
public class VerificationgCode {
    public static void main(String[] args) {
        String code=generateVeriCode(6);
        System.out.println(code);

    }
    public static String generateVeriCode(int len){
        String code ="";
        char[] chs = {'a','b','c','d','e','f','g','h','i','j','k',
                'l','m','n','o','p','q','r','s','t','u','v',
                'w','x','y','z','A','B','C','D','E','F','G',
                'H','I','J','K','L','M','N','O','P','Q','R',
                'S','T','U','V','W','X','Y','Z','0','1','2',
                '3','4','5','6','7','8','9'};
        for (int i = 0; i < len; i++) {
            Random rand =new Random();
            int index= rand.nextInt(chs.length);
            code+=chs[index];
        }

        return code;
    }

}
